/**
* Given a file object, this creates a PLUSFile representation filled with appropriate metadata,
* file owner, and so on.
*
* @param file
* @return
*/
public static PLUSFile extractMetadata(File file, AbstractProvenanceClient client) {
if (!file.exists() || !file.canRead()) return null;
PLUSFile f = new PLUSFile(file);
// Try to figure out who owns this file, if it exists.
if (f.getOwner() == null) {
// This is a java-7 ism that permits us to access the file owner.
try {
Path path = Paths.get(file.getAbsolutePath());
UserPrincipal owner = Files.getOwner(path);
String username = owner.getName();
try {
PLUSActor a = client.actorExistsByName(username);
if (a == null) a = new PLUSActor(username);
f.setOwner(a);
} catch (PLUSException e) {
log.warning(e.getMessage());
}
} catch (IOException exc) {
log.warning(exc.getMessage());
}
}
try {
f.getMetadata().put("isLink", "" + file.getCanonicalFile().equals(file.getAbsoluteFile()));
} catch (Exception exc) {;
}
try {
f.getMetadata().put("exists", "" + file.exists());
} catch (Exception exc) {;
}
try {
f.getMetadata().put("path", file.getAbsolutePath());
} catch (Exception exc) {;
}
try {
f.getMetadata().put("canonical", file.getCanonicalPath());
} catch (Exception exc) {;
}
try {
f.getMetadata().put("directory", "" + file.isDirectory());
} catch (Exception exc) {;
}
try {
f.getMetadata().put("lastmodified", "" + file.lastModified());
} catch (Exception exc) {;
}
try {
f.getMetadata().put("size", "" + file.length());
} catch (Exception exc) {;
}
return f;
} // End extractMetadata
public static void main(String[] args) throws IOException {
Path path = Paths.get(FileService.FILE_WITH_LINES);
System.out.println("Files.isDirectory = " + Files.isDirectory(path));
System.out.println("Files.isExecutable = " + Files.isExecutable(path));
System.out.println("Files.isHidden = " + Files.isHidden(path));
System.out.println("Files.isReadable = " + Files.isReadable(path));
System.out.println("Files.isWritable = " + Files.isWritable(path));
System.out.println("Files.getLastModifiedTime = " + Files.getLastModifiedTime(path));
System.out.println("Files.getOwner = " + Files.getOwner(path));
System.out.println("Files.size = " + Files.size(path));
// change attribute: Files.setAttribute(path, "dos:hidden", false);
}
/*
* Make file non-readable by modifying its permissions.
* If file supports "posix" attributes, then modify it.
* Otherwise check for "acl" attributes.
*/
private static void makeFileNonReadable(String file) throws IOException {
Path filePath = Paths.get(file);
Set<String> supportedAttr = filePath.getFileSystem().supportedFileAttributeViews();
if (supportedAttr.contains("posix")) {
Files.setPosixFilePermissions(filePath, PosixFilePermissions.fromString("-w--w----"));
} else if (supportedAttr.contains("acl")) {
UserPrincipal fileOwner = Files.getOwner(filePath);
AclFileAttributeView view = Files.getFileAttributeView(filePath, AclFileAttributeView.class);
AclEntry entry =
AclEntry.newBuilder()
.setType(AclEntryType.DENY)
.setPrincipal(fileOwner)
.setPermissions(AclEntryPermission.READ_DATA)
.build();
List<AclEntry> acl = view.getAcl();
acl.add(0, entry);
view.setAcl(acl);
}
}